Punch-press guard.



J. M. JELSEMA.

PUNCH PRESS GU'ARD.

APPLICATION FILED iUNE B. 1918.

1,801,567., Patented Apr. 22, 1919.

72st 1. If

1 /1 11 MQJQHQMEL JOHN M. JELSEIVIA, 0F GRAND RAPIDS, MICHIGAN.

PUNCH-PRESS GUARD.

Specification of Letters Patent.

Patented Apr. 22, 121.9.

Application filed June 8, 1918. Serial 11' 0. 239,079.

To all whom it may concern:

Be it known that I, JOHN M. JELSEMA, a citizen of the United States, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Punch-Press Guards, of which the following is a specification.

My invention relates to improvements 1n guards for use upon punch presses to avert the danger of injuring the hands of the operator when operating the press for punch press work, and its object is, to so time and operate the guard that it will, invariably, push the hand of the operator from under the punch before the punch can possibly catch the hand or finger of the operator.

I attain this object by the mechanism and construction shown in the accompanying drawing, in which Figure 1 is a front elevation of the upper end of a punch press. Fig. 2 is a sectional plan of the same shown below the line 2-2 of Fig. 1, and, Fig. 3 is an elevation of the actuating rack detached from the press.

Similar reference numerals indicate similar parts throughout the several views.

In the drawings 1 represents the press frame, 2 is the plunger shaft, 3 is the plunger head, 4 is the fly wheel, 5 is the plunger proper, 6 is the press bed, 7 is a supporting girt secured to the frame of the press for the support of the shaft that carries the pinion 9 and the guard head 10. The guard consists of a swlnging arm 11, that is mounted in the head 10, which latter is journaled to the girt 7, and has, connected therewith, the gear wheel 9, so located and mounted that when the lunger 5 is forced downward the rack 8 W111 be drawn downward with it and, acting upon the gear wheel 9, will cause it to revolve and to throw the arm 11 around into the position indicated by its dotted lines to the left of Fig. 1.

The cross-head 16, carrying the plunger 5, is made to travel upon the guide-ways or slides 15, in the usual manner.

To avert the danger of injuring the hand of the operator by a sudden stroke of the arm 11 I have pivoted a flexible wing 12 to the.arm, as at 14:, and hold it, normally, away from the end of the arm by means of a very flexible spring, as 13.

17 is the spring case for the safety lock 18, and 19 is the lock clutch mounted in the driving wheel 4:.

With the construction shown and described it is readily seen that the plunger 5 cannot be moved either upwardly or downwardly without actuating the guard 11 to swing it from side to side as indicated, and at such times as to absolutely guard the hand of the operator against any possible chance of accident to the operator, such as are common upon unguarded punch presses.

As this guard is actuated wholly by the vertical movement of the press plunger, it does not cease to work when the trip pedal is not operated, as in case the fly wheel be comes set upon the shaft, the brake band is set, or broken, or gets loose, or the breaking of the latch bracket, or other accident whereby the plunger will continue to operate after the foot is removed from the clutch pedal, thus rendering it a perfectly reliable guard against injury to the operator of a punch press.

What I claim as new in the art is:

1. In combination with a punch press and its plunger, a girt secured to the frame of the press front of the plunger, an arm pivotally mounted near one end at the longitudinal center of the girt, a gear wheel con nected with the pivotal element of the arm, and a rack connected with the plunger in position to operate the gear wheel to swing the arm from side to side by the vertical reciprocations of the plunger.

2. In combination with the frame, plunger and several elements of a punch press, a girt secured across the frame front of the plunger, an arm pivotally mounted, at one end, to the longitudinal center of the girt, a gear wheel mounted upon the pivotal element of the arm, a rack connected with the plunger in position to engage the gear wheel and cause it to revolve with the vertical movement of the plunger to swing the arm from side to side, and a spring actuated buffer pivotally mounted near the lower end of the arm.

Signed at Grand Rapids, Michigan, June 1, 1918.

JOHN M. JELSEMA.

Copies oi this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

